Don't know the rest of your situation, but I can't see how this is a good idea... when you're making double that later on in your career, you can pick up a CPO M3.

When I was at your stage of my career (no debts), I had an old air-cooled 911 that I got for around $18k... but to get a car for double that (or more), bad move. Max your 401k now, the M3 will come in time.